Usain Bolt runs to three-peat as world’s fastest man

In live coverage (ET/CT) of track and field, Jamaican sprint sensation Usain Bolt attempts to become the first man to win three Olympic titles in the 100m; among his rivals is the Athens 2004 gold medalist, Justin Gatlin of the U.S. Also on the track, American LaShawn Merritt seeks a return to the 400m podium after his 2008 triumph.